查找LINQ的用戶排名

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enter image description here 如何通過LINQ獲取表中用戶的排名？我用VB.NET代碼查找LINQ的用戶排名

，如果我們有我們的表這些領域

[ID，姓名，成績]

爲了用戶，我們怎麼能拿到名次（行號）的分數後一個他們在我們的查詢？

來源

2017-02-17 Ali

凌？聽起來太酷了。我想得到一盒 – Plutonix

你不會爲此使用LINQ。 – jmcilhinney

當你有兩個記錄相同的分數，你如何確定分數是什麼？在你的例子中，你有''A1''''A7「'具有相同得分'7'，但''A1''具有等級'3'和''A7」'具有等級4。系統他們都分享'3'，並且排名會直接跳到下一個'5'。你想怎麼做？ – Enigmativity

謝謝你的男人。我用波紋管的代碼，它的工作對我罰款：

 Dim query = (From P In DB.tblUserScores Order By P.Score 
              Descending Select P).AsEnumerable() 

     Dim Rank As Integer = 1 
     For Each userObj As tblUserScore In query 
      If userObj.DeviceId = DeviceID Then Exit For 
      Rank += 1 
     Next

來源

2017-02-20 00:19:05 Ali

是的，這是更好的方法，但我認爲它應該返回Rank = 5（因爲A1和A7都有7分數）我們該如何解決這個問題？謝謝 – Ali

方法如下：

Dim records = _ 
{ _ 
    New With { Key .ID = 1, Key .Name = "A1", Key .Score = 7 }, _ 
    New With { Key .ID = 2, Key .Name = "A2", Key .Score = 9 }, _ 
    New With { Key .ID = 3, Key .Name = "A3", Key .Score = 2 }, _ 
    New With { Key .ID = 4, Key .Name = "A4", Key .Score = 1 }, _ 
    New With { Key .ID = 5, Key .Name = "A5", Key .Score = 6 }, _ 
    New With { Key .ID = 6, Key .Name = "A6", Key .Score = 4 }, _ 
    New With { Key .ID = 7, Key .Name = "A7", Key .Score = 7 }, _ 
    New With { Key .ID = 8, Key .Name = "A8", Key .Score = 3 }, _ 
    New With { Key .ID = 9, Key .Name = "A9", Key .Score = 5 }, _ 
    New With { Key .ID = 10, Key .Name = "A10", Key .Score = 8 } _ 
} 

Dim query = _ 
    From r In Records _ 
    Order By r.Name Ascending 
    Order By r.Score Descending 
    Select r 

query.Dump() 

Dim rank = _ 
    query _ 
     .Select(Function (x, n) New With { Key .Record = x, Key .Rank = n + 1 }) _ 
     .ToDictionary(Function (x) x.Record.Name, Function (x) x.Rank) 

Dim name = "A9" 
Console.WriteLine("User " & name & "'s Rank is " & rank(name))

這給了我：

 
User A9's Rank is 6

來源

2017-02-20 01:05:06 Enigmativity

查找LINQ的用戶排名

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